Illinois State Geological Survey2002Generalized depth of the Colchester Coal
1.0 (Prior to 2002 no version numbers had been assigned
to this coverage.
vector digital dataISGS GIS Databasecolch_dpChampaign, IllinoisIllinois State Geological SurveynoneGISDB_COAL_IL_Colchester_Depth_Py\\KOROSE\C$\Documents and Settings\korose\Desktop\coalres_shapes_dd\GISDB_COAL_IL_Colchester_Depth_Py.shp
This datafile shows a highly generalized depth to the top of the Colchester Coal in Illinois. These 100-foot contours were created by Earthvision software using more than 9,500 data from drill holes. Because the depth of the coal was contoured directly from drill hole data (as opposed to creating a map of coal elevation and subtracting it from a map of surface topography) the resulting map is essentially based on the assumption that the land surface is a level plain. Consequently, the accuracy of the map is lowest where the coal is shallowest. Data control was poor in parts of central Illinois. This data set is intended for use at a scale of 1:750,000.
This data set was created as part of the ISGS GIS database to show general depth of the Colchester Coal seam. The data are appropriate for regional analysis.
These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set was originally created for the purpose of producing maps of well locations in Illinois for geologic research by the ISGS and others. It serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.noneen2002publication date of sourcesIrregular-91.216208-87.49521441.52263337.591290-91.216208-87.49521437.59129041.522633nonegeologycoalcoal seamsmineralresourcesstructuredepthColchesternoneIllinoisnonePennsylvaniannoneReproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensee's organization or entity is expressly forbidden. The only exception is redistribution to consultants working for the licensee, and then only for purposes related to work for the licensee. Such consultants may not further reproduce or redistribute these data sets. None of these data shall be electronically duplicated on magnetic or optical media for use by others, in whole or in part, without permission of DNR. Any hardcopies utilizing DNR data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent DNR data sets, nor to imply that changes they made were approved by DNR. These data are not to be used for commercial profit.Christopher P. KoroseIllinois State Geological Survey - Coal Sectionmailing address
615 East Peabody Drive
ChampaignIllinois61820USA217-244-2414
Contact_Instructions Contact this individual ONLY for specific information about the use of this data set. For general questions about distribution, or availability of other data, please contact the Information Office as listed under the Distribution_Information section.
Hours_of_Service 8:00 a.m. - 5:00 p.m., Monday-Friday
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800Shapefile
The attributes of the original ArcInfo coverage were reviewed
in 2001 by visual inspection of the contours for depth anomolies
and comparison with earlier depth maps. Original point-source
data associated with anomolies were checked for accuracy of
location and correlation. These reviews were performed in an
iterative fashion.
Accuracy of point-source information is variable, depending
on the source materials and the geologist. Some logs are
precise measurements of thickness and depth, others may have
errors or be rounded. Geologic correlations are, of course,
open to other interpretations. In general: measurements from
core descriptions and coal test geophysical logs are accurate
to within fractions of an inch; measurements from drillers
logs may be accurate to within an inch to 5 feet, depending
on the equipment used and the experience of the on-site geologist;
measurements from oil test geophysical logs are accurate to
within +/- one foot.
Formal evaluation tests have not been run, but daily
hands-on experience using the data for real-life
applications has proven the quality of the point-source database.
Experience suggests that less than 1% of the data contain
errors that involve gross mis-location of points or
mis-correlation of coals.
This map did not make use of all available point-source data.
This map was created to depict broad regional trends in depth
of the coal. Contours were created directly from point-source
data on coal depth with no consideration given to local or
regional topography. This method assumes that the land
surface is a level plain. Given that surface elevation in
Illinois rarely varies by more than 100 feet (and commonly
less than 50 feet) over short distances, this method results
in a reasonably accurate regional depiction of coal depth.
The greatest inaccuracies are where the coal is less than
200 feet deep.
More detailed, larger scale maps should be consulted for
site-specific information on coal depth.
Polygon topology is present.
The point-source data was compiled by ISGS staff for various projects
(primarily related to coal resources, structure, and mining
geology) dating back to 1938. This subset was compiled for
and is available from the USGS's National Coal Resources Data
System. No attempt has been made to compile all available
data. This file does not represent all the well records on
file at the ISGS, nor should the absence of data for one or
more coals for a specific data point be interpreted to mean
that those coals are not present.
This is a generalized depiction of regional ground condition.
Horizontal positional accuracy of the original point-source
data is generally unknown. There is considerable variability
depending on the source material. Some holes have surveyed
locations and are accurate to within a foot, others have only
description to the nearest forty acres. Overall, the database
administrator estimates that most points are within 500 feet of
their correct locations, but no scientific tests have been done
to verify this.
ISGS Coal Section2001Coal Stratigraphic DatamapISGS Mapsame as titleChampaign, IllinoisIllinois State Geological Surveypaper2001publication datenoneAll attribute informationTreworgy, J.D. and M.H. Bargh1984Coal Resources of Illinois: Colchester CoalmapISGS Mapsame as titleChampaign, IllinoisIllinois State Geological Survey500000paper1984publication datenoneOutcrop line
Extraction of point-source data
Data points that contained an x/y coordinate and a depth
of the Colchester Coal were extracted from the coal stratigraphic
data base and formatted for Earthvision.
2001
Contouring of depth
Depth of coal as reported by point-source data was contoured
using Dynamic Graphic Inc.'s Earthvision software. Grid size
was set to 2000 feet. Defaults were used for all other parameters.
2001
Post-contouring Processing
1. The modified Earthvision grid was exported to an Arc line
coverage and clipped using the outcrop of the Colchester Coal.
2. Items for the .PAT and the .AAT files were added
to the coverage. The .PAT items were:
depth_colchester 8 8 N 2
The .AAT items were:
depth_colchester 8 8 N 2
3. The line coverage was converted to a polygon coverage by
automatically assigning the average value of bounding lines
to each polygon (e.g. if a polygon was bounded by a 400 ft and
500 ft isoline, the polygon was assigned the value of 450 ft).
Peak and valley polygons were assigned a value of plus or minus
50 ft of the bounding polygon (e.g. if a peak polygon was surrounded
by a 500 ft isoline, the polygon was assigned a value of 550 ft).
The polygon bounded by the 200 foot contour and the coal crop was
assigned a value of 175 feet.
4. Polygons less than 250 million square feet in area were
considered to be artifacts of processing unsupported by the
grid size used to contour the point-source data. These polygons
were eliminated using the Arc eliminate command.
2001
Existing depth polyons in northern Illinois from coal resource coverage
library were used where detailed depth-mapping was previously done
(e.g. in LaSalle near areas of coal erosion or features of the LaSalle
Anticlinorium). These counties were updated into the statewide depth
coverage using ArcInfo, checked, and edited to match across county
boundaries.
2002Metadata imported.C:\TEMP\xmlD7.tmpMetadata imported.C:\TEMP\xml15B.tmpMetadata imported.C:\TEMP\xml3A.tmpMetadata imported.C:\TEMP\xml181.tmp20040413VectorSimpleFALSE0TRUEFALSE0.0000010.000001Decimal degreesNorth American Datum of 1983Geodetic Reference System 806378137.000000298.257222GCS_North_American_1983not applicableExplicit elevation coordinate included with horizontal coordinatesITEM_LABELITEM_LABELString2000DEPTH_COLCOBJECTIDOID400Area of feature in internal units squared.EsriPositive real numbers that are automatically generated.SHAPE_AREAShape_AreaDouble8Area of feature in internal units squared.ESRIPositive real numbers that are automatically generated.00ShapeShapeGeometry0Feature geometry.ESRICoordinates defining the features.00SHAPEFeature geometry.ESRICoordinates defining the features.Shape_LengthDouble800source_tableSource TableString25500source_organizationSource OrganizationString25500hyperlinkLinkString25500resource_dateDate of ResourceString25500source_IDSource IDString25500spatial_qualitySpatial Data QualityString25500temporal_qualityTemporal Data QualityDString25500source_qualitySource Data QualityString25500GISDB_COAL.IL_Colchester_Depth_PyFeature Class0Shape_LengthDEPTH_COLCSingle400Length of feature in internal units.EsriPositive real numbers that are automatically generated.
Attribute items are in typical ARC/INFO feature class format.
User-defined attributes are:
Polygon attributes:
DEPTH_COLCH - Average depth of the top of the Colchester
Coal within the polygon. The contour interval is 100
feet and polygon boundary lines represent these contours
(e.g. 300, 400, 500, etc.)
Actual polygon values (e.g. 350, 450, etc.) reflect the
average coal depth within the polygon, as based on the bounding
contours.
noneIllinois State Geological SurveyInformation Officemailing and physical address
615 East Peabody Drive
ChampaignIllinois61820U.S.A.217-244-2414217-244-0802isgs@isgs.uiuc.edu8:00 a.m. - 5:00 p.m., Monday-FridayDownloadable Data
The Illinois Department of Natural Resources (DNR) provides these
geographic data "as is." DNR makes no guarantee or warranty
concerning the accuracy of information contained in the geographic
data. DNR further makes no warranties, either expressed or implied
as to any other matter whatsoever, including, without limitation,
the condition of the product, or its fitness for any particular
purpose. The burden for determining fitness for use lies entirely
with the user. Although these data have been processed successfully
on computers of DNR, no warranty, expressed or implied, is made by
DNR regarding the use of these data on any other system, nor does the
fact of distribution constitute or imply any such warranty.
In no event shall the DNR have any liability whatsoever for payment
of any consequential, incidental, indirect, special, or tort damages
of any kind, including, but not limited to, any loss of profits
arising out of use of or reliance on the geographic data or arising
out of the delivery, installation, operation, or support by DNR.
0.0000.0002004032520020830Christopher P. KoroseIllinois State Geological Surveymailing address
615 East Peabody Drive
ChampaignIllinois61820USA217-244-2422217-333-2830korose@isgs.uiuc.eduFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local timeThis metadata document is intended for public distributionnonehttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profilehttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profilehttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profileen2023020315405400FALSE20221021113907002023032816143700CopyFeatures GISDB_COAL.IL_Colchester_Depth_Py "C:\Documents and Settings\korose\Desktop\coalres_shapes_dd\GISDB_COAL_IL_Colchester_Depth_Py.shp" # 0 0 0CopyFeatures "P:\01_DataOriginals\Carbon Storage\Future_Gen_data\T31 - Relevant graphics maps and GIS data\T31.8 ILLINOIS GEOSPATIAL DATA SETS\ILLINOIS BEDROCK VALLEYS\IL_Colchester_Depth_Py.shp" C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth # # # #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_table Text 500 # # "Source Table" NULLABLE NON_REQUIRED #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_organization Text 255 # # "Source Organization" NULLABLE NON_REQUIRED #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth hyperlink Text 500 # # Link NULLABLE NON_REQUIRED #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth resource_date Text 50 # # "Date of Resource" NULLABLE NON_REQUIRED #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_ID Text 50 # # "Source ID" NULLABLE NON_REQUIRED #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth spatial_quality Text 20 # # "Spatial Data Quality" NULLABLE NON_REQUIRED #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth temporal_quality Text 20 # # "Temporal Data QualityD" NULLABLE NON_REQUIRED #AddField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_quality Text 20 # # "Source Data Quality" NULLABLE NON_REQUIRED #CalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_table "P:\01_DataOriginals\Carbon Storage\Future_Gen_data\T31 - Relevant graphics maps and GIS data\T31.8 ILLINOIS GEOSPATIAL DATA SETS\ILLINOIS BEDROCK VALLEYS\IL_Colchester_Depth_Py.shp" "Python 3" # Text NO_ENFORCE_DOMAINSCalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_organization "FutureGen 2.0 Technical Data, 6/25/2020, https://edx.netl.doe.gov/dataset/vetted-futuregen-2-0-technical-data, DOI: 10.18141/1635379" "Python 3" # Text NO_ENFORCE_DOMAINSCalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth hyperlink "https://edx.netl.doe.gov/dataset/vetted-futuregen-2-0-technical-data" "Python 3" # Text NO_ENFORCE_DOMAINSCalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth resource_date "" "Python 3" # Text NO_ENFORCE_DOMAINSCalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_ID "60" "Python 3" # Text NO_ENFORCE_DOMAINSCalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth spatial_quality "KEEP THIS ONE" "Python 3" # Text NO_ENFORCE_DOMAINSCalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth temporal_quality "" "Python 3" # Text NO_ENFORCE_DOMAINSCalculateField C:\Projects\NATCARB\OpenData3-18-22\NATCARBOpenData6-3-22.gdb\Geology\Colchester_Unit_Depth source_quality "" "Python 3" # Text NO_ENFORCE_DOMAINSCopyFeatures "P:\03_DataFinal\Carbon Storage Open Database - and Natcarb\Carbon Storage Open Database Geospatial\CarbonStorgeOpenData7-19-22.gdb\Geology\Colchester_Unit_Depth" P:\02_DataWorking\EDX4CCS\Task_3.2\Morkner_Task3_2\Morkner_Task3_2.gdb\Colchester_Unit_Depth # # # #file://\\research.local\GAIA\02_DataWorking\EDX4CCS\Task_3.2\Morkner_Task3_2\Morkner_Task3_2_project.gdbLocal Area NetworkColchester_Unit_Depth002GeographicGCS_North_American_1983Angular Unit: Degree (0.017453)<GeographicCoordinateSystem xsi:type='typens:GeographicCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.0.0'><WKT>GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG",4269]]</WKT><XOrigin>-400</XOrigin><YOrigin>-400</YOrigin><XYScale>999999999.99999988</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>8.983152841195215e-09</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><LeftLongitude>-180</LeftLongitude><WKID>4269</WKID><LatestWKID>4269</LatestWKID></GeographicCoordinateSystem>1.01500000005000ItemDescriptionMicrosoft Windows 10 Version 10.0 (Build 19044) ; Esri ArcGIS 13.0.0.36056Colchester_MIL1-91.216208-87.49521441.52263337.591291-91.216208-87.49521441.52263337.591291FutureGen 2.0 Technical Data, 6/25/2020, https://edx.netl.doe.gov/dataset/vetted-futuregen-2-0-technical-data, DOI: 10.18141/1635379Class VIPublic accessIsopach (thickness) maps of confining zone
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